src/mesa/drivers/dri/swrast/swrast.c

   1 /*
   2  * Copyright (C) 2008 George Sapountzis <gsap7@yahoo.gr>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 /*
  23  * DRI software rasterizer
  24  *
  25  * This is the mesa swrast module packaged into a DRI driver structure.
  26  *
  27  * The front-buffer is allocated by the loader. The loader provides read/write
  28  * callbacks for access to the front-buffer. The driver uses a scratch row for
  29  * front-buffer rendering to avoid repeated calls to the loader.
  30  *
  31  * The back-buffer is allocated by the driver and is private.
  32  */
  33
  34 #include "main/context.h"
  35 #include "main/extensions.h"
  36 #include "main/framebuffer.h"
  37 #include "main/imports.h"
  38 #include "main/renderbuffer.h"
  39 #include "swrast/swrast.h"
  40 #include "swrast_setup/swrast_setup.h"
  41 #include "tnl/tnl.h"
  42 #include "tnl/t_context.h"
  43 #include "tnl/t_pipeline.h"
  44 #include "vbo/vbo.h"
  45 #include "drivers/common/driverfuncs.h"
  46 #include "utils.h"
  47
  48 #include "swrast_priv.h"
  49
  50
  51 #define need_GL_VERSION_1_3
  52 #define need_GL_VERSION_1_4
  53 #define need_GL_VERSION_1_5
  54 #define need_GL_VERSION_2_0
  55 #define need_GL_VERSION_2_1
  56
  57 /* sw extensions for imaging */
  58 #define need_GL_EXT_blend_color
  59 #define need_GL_EXT_blend_minmax
  60 #define need_GL_EXT_convolution
  61 #define need_GL_EXT_histogram
  62 #define need_GL_SGI_color_table
  63
  64 /* sw extensions not associated with some GL version */
  65 #define need_GL_ARB_draw_elements_base_vertex
  66 #define need_GL_ARB_shader_objects
  67 #define need_GL_ARB_vertex_array_object
  68 #define need_GL_ARB_vertex_program
  69 #define need_GL_ARB_sync
  70 #define need_GL_APPLE_vertex_array_object
  71 #define need_GL_ATI_fragment_shader
  72 #define need_GL_ATI_separate_stencil
  73 #define need_GL_EXT_depth_bounds_test
  74 #define need_GL_EXT_framebuffer_object
  75 #define need_GL_EXT_framebuffer_blit
  76 #define need_GL_EXT_gpu_program_parameters
  77 #define need_GL_EXT_paletted_texture
  78 #define need_GL_EXT_stencil_two_side
  79 #define need_GL_MESA_resize_buffers
  80 #define need_GL_NV_vertex_program
  81 #define need_GL_NV_fragment_program
  82
  83 #include "extension_helper.h"
  84
  85 const struct dri_extension card_extensions[] =
  86 {
  87     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  88     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  89     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  90     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  91     { "GL_VERSION_2_1",                 GL_VERSION_2_1_functions },
  92
  93     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  94     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  95     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  96     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  97     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  98
  99     { "GL_ARB_depth_clamp",             NULL },
 100     { "GL_ARB_draw_elements_base_vertex", GL_ARB_draw_elements_base_vertex_functions },
 101     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
 102     { "GL_ARB_vertex_array_object",     GL_ARB_vertex_array_object_functions },
 103     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
 104     { "GL_ARB_sync",                    GL_ARB_sync_functions },
 105     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
 106     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
 107     { "GL_ATI_separate_stencil",        GL_ATI_separate_stencil_functions },
 108     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
 109     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
 110     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
 111     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
 112     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
 113     { "GL_EXT_stencil_two_side",        GL_EXT_stencil_two_side_functions },
 114     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
 115     { "GL_NV_depth_clamp",              NULL },
 116     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
 117     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
 118     { NULL,                             NULL }
 119 };
 120
 121
 122 /**
 123  * Screen and config-related functions
 124  */
 125
 126 static void
 127 setupLoaderExtensions(__DRIscreen *psp,
 128                       const __DRIextension **extensions)
 129 {
 130     int i;
 131
 132     for (i = 0; extensions[i]; i++) {
 133         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 134             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 135     }
 136 }
 137
 138 static __DRIconfig **
 139 swrastFillInModes(__DRIscreen *psp,
 140                   unsigned pixel_bits, unsigned depth_bits,
 141                   unsigned stencil_bits, GLboolean have_back_buffer)
 142 {
 143     __DRIconfig **configs;
 144     unsigned depth_buffer_factor;
 145     unsigned back_buffer_factor;
 146     GLenum fb_format;
 147     GLenum fb_type;
 148
 149     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 150      * support pageflipping at all.
 151      */
 152     static const GLenum back_buffer_modes[] = {
 153         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 154     };
 155
 156     uint8_t depth_bits_array[4];
 157     uint8_t stencil_bits_array[4];
 158     uint8_t msaa_samples_array[1];
 159
 160     depth_bits_array[0] = 0;
 161     depth_bits_array[1] = 0;
 162     depth_bits_array[2] = depth_bits;
 163     depth_bits_array[3] = depth_bits;
 164
 165     /* Just like with the accumulation buffer, always provide some modes
 166      * with a stencil buffer.
 167      */
 168     stencil_bits_array[0] = 0;
 169     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 170     stencil_bits_array[2] = 0;
 171     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 172
 173     msaa_samples_array[0] = 0;
 174
 175     depth_buffer_factor = 4;
 176     back_buffer_factor = 2;
 177
 178     switch (pixel_bits) {
 179     case 8:
 180         fb_format = GL_RGB;
 181         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 182         break;
 183     case 16:
 184         fb_format = GL_RGB;
 185         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 186         break;
 187     case 24:
 188         fb_format = GL_BGR;
 189         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 190         break;
 191     case 32:
 192         fb_format = GL_BGRA;
 193         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 194         break;
 195     default:
 196         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 197                 pixel_bits);
 198         return NULL;
 199     }
 200
 201     configs = driCreateConfigs(fb_format, fb_type,
 202                                depth_bits_array, stencil_bits_array,
 203                                depth_buffer_factor, back_buffer_modes,
 204                                back_buffer_factor, msaa_samples_array, 1);
 205     if (configs == NULL) {
 206         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 207                 __LINE__);
 208         return NULL;
 209     }
 210
 211     return configs;
 212 }
 213
 214 static __DRIscreen *
 215 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 216                    const __DRIconfig ***driver_configs, void *data)
 217 {
 218     static const __DRIextension *emptyExtensionList[] = { NULL };
 219     __DRIscreen *psp;
 220     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 221
 222     (void) data;
 223
 224     TRACE;
 225
 226     psp = _mesa_calloc(sizeof(*psp));
 227     if (!psp)
 228         return NULL;
 229
 230     setupLoaderExtensions(psp, extensions);
 231
 232     psp->num = scrn;
 233     psp->extensions = emptyExtensionList;
 234
 235     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 236     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 237     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 238     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 239
 240     configs16 = driConcatConfigs(configs8, configs16);
 241     configs24 = driConcatConfigs(configs16, configs24);
 242     *driver_configs = (const __DRIconfig **)
 243        driConcatConfigs(configs24, configs32);
 244
 245     driInitExtensions( NULL, card_extensions, GL_FALSE );
 246
 247     return psp;
 248 }
 249
 250 static void driDestroyScreen(__DRIscreen *psp)
 251 {
 252     TRACE;
 253
 254     if (psp) {
 255         _mesa_free(psp);
 256     }
 257 }
 258
 259 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 260 {
 261     TRACE;
 262
 263     return psp->extensions;
 264 }
 265
 266
 267 /**
 268  * Framebuffer and renderbuffer-related functions.
 269  */
 270
 271 static GLuint
 272 choose_pixel_format(const GLvisual *v)
 273 {
 274     if (v->rgbMode) {
 275         int depth = v->rgbBits;
 276
 277         if (depth == 32
 278             && v->redMask   == 0xff0000
 279             && v->greenMask == 0x00ff00
 280             && v->blueMask  == 0x0000ff)
 281             return PF_A8R8G8B8;
 282         else if (depth == 24
 283             && v->redMask   == 0xff0000
 284             && v->greenMask == 0x00ff00
 285             && v->blueMask  == 0x0000ff)
 286             return PF_X8R8G8B8;
 287         else if (depth == 16
 288             && v->redMask   == 0xf800
 289             && v->greenMask == 0x07e0
 290             && v->blueMask  == 0x001f)
 291             return PF_R5G6B5;
 292         else if (depth == 8
 293             && v->redMask   == 0x07
 294             && v->greenMask == 0x38
 295             && v->blueMask  == 0xc0)
 296             return PF_R3G3B2;
 297     }
 298     else {
 299         if (v->indexBits == 8)
 300             return PF_CI8;
 301     }
 302
 303     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 304     return 0;
 305 }
 306
 307 static void
 308 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 309 {
 310     TRACE;
 311
 312     _mesa_free(rb->Data);
 313     _mesa_free(rb);
 314 }
 315
 316 static GLboolean
 317 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 318                            GLenum internalFormat, GLuint width, GLuint height)
 319 {
 320     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 321     unsigned mask = PITCH_ALIGN_BITS - 1;
 322
 323     TRACE;
 324
 325     rb->Data = NULL;
 326     rb->Width = width;
 327     rb->Height = height;
 328
 329     /* always pad to PITCH_ALIGN_BITS */
 330     xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
 331
 332     return GL_TRUE;
 333 }
 334
 335 static GLboolean
 336 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 337                           GLenum internalFormat, GLuint width, GLuint height)
 338 {
 339     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 340
 341     TRACE;
 342
 343     _mesa_free(rb->Data);
 344
 345     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 346
 347     rb->Data = _mesa_malloc(height * xrb->pitch);
 348
 349     return GL_TRUE;
 350 }
 351
 352 static struct swrast_renderbuffer *
 353 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 354 {
 355     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 356     GLuint pixel_format;
 357
 358     TRACE;
 359
 360     if (!xrb)
 361         return NULL;
 362
 363     _mesa_init_renderbuffer(&xrb->Base, 0);
 364
 365     pixel_format = choose_pixel_format(visual);
 366
 367     xrb->Base.Delete = swrast_delete_renderbuffer;
 368     if (front) {
 369         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 370         swrast_set_span_funcs_front(xrb, pixel_format);
 371     }
 372     else {
 373         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 374         swrast_set_span_funcs_back(xrb, pixel_format);
 375     }
 376
 377     switch (pixel_format) {
 378     case PF_A8R8G8B8:
 379         xrb->Base.InternalFormat = GL_RGBA;
 380         xrb->Base._BaseFormat = GL_RGBA;
 381         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 382         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 383         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 384         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 385         xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 386         xrb->bpp = 32;
 387         break;
 388     case PF_X8R8G8B8:
 389         xrb->Base.InternalFormat = GL_RGB;
 390         xrb->Base._BaseFormat = GL_RGB;
 391         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 392         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 393         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 394         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 395         xrb->Base.AlphaBits = 0;
 396         xrb->bpp = 32;
 397         break;
 398     case PF_R5G6B5:
 399         xrb->Base.InternalFormat = GL_RGB;
 400         xrb->Base._BaseFormat = GL_RGB;
 401         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 402         xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 403         xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 404         xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 405         xrb->Base.AlphaBits = 0;
 406         xrb->bpp = 16;
 407         break;
 408     case PF_R3G3B2:
 409         xrb->Base.InternalFormat = GL_RGB;
 410         xrb->Base._BaseFormat = GL_RGB;
 411         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 412         xrb->Base.RedBits   = 3 * sizeof(GLubyte);
 413         xrb->Base.GreenBits = 3 * sizeof(GLubyte);
 414         xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
 415         xrb->Base.AlphaBits = 0;
 416         xrb->bpp = 8;
 417         break;
 418     case PF_CI8:
 419         xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 420         xrb->Base._BaseFormat = GL_COLOR_INDEX;
 421         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 422         xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 423         xrb->bpp = 8;
 424         break;
 425     default:
 426         return NULL;
 427     }
 428
 429     return xrb;
 430 }
 431
 432 static __DRIdrawable *
 433 driCreateNewDrawable(__DRIscreen *screen,
 434                      const __DRIconfig *config, void *data)
 435 {
 436     __DRIdrawable *buf;
 437     struct swrast_renderbuffer *frontrb, *backrb;
 438
 439     TRACE;
 440
 441     buf = _mesa_calloc(sizeof *buf);
 442     if (!buf)
 443         return NULL;
 444
 445     buf->loaderPrivate = data;
 446
 447     buf->driScreenPriv = screen;
 448
 449     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 450
 451     /* basic framebuffer setup */
 452     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 453
 454     /* add front renderbuffer */
 455     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 456     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 457
 458     /* add back renderbuffer */
 459     if (config->modes.doubleBufferMode) {
 460         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 461         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 462     }
 463
 464     /* add software renderbuffers */
 465     _mesa_add_soft_renderbuffers(&buf->Base,
 466                                  GL_FALSE, /* color */
 467                                  config->modes.haveDepthBuffer,
 468                                  config->modes.haveStencilBuffer,
 469                                  config->modes.haveAccumBuffer,
 470                                  GL_FALSE, /* alpha */
 471                                  GL_FALSE /* aux bufs */);
 472
 473     return buf;
 474 }
 475
 476 static void
 477 driDestroyDrawable(__DRIdrawable *buf)
 478 {
 479     TRACE;
 480
 481     if (buf) {
 482         struct gl_framebuffer *fb = &buf->Base;
 483
 484         _mesa_free(buf->row);
 485
 486         fb->DeletePending = GL_TRUE;
 487         _mesa_reference_framebuffer(&fb, NULL);
 488     }
 489 }
 490
 491 static void driSwapBuffers(__DRIdrawable *buf)
 492 {
 493     GET_CURRENT_CONTEXT(ctx);
 494
 495     struct swrast_renderbuffer *frontrb =
 496         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 497     struct swrast_renderbuffer *backrb =
 498         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 499
 500     __DRIscreen *screen = buf->driScreenPriv;
 501
 502     TRACE;
 503
 504     /* check for signle-buffered */
 505     if (backrb == NULL)
 506         return;
 507
 508     /* check if swapping currently bound buffer */
 509     if (ctx && ctx->DrawBuffer == &(buf->Base)) {
 510         /* flush pending rendering */
 511         _mesa_notifySwapBuffers(ctx);
 512     }
 513
 514     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 515                                     0, 0,
 516                                     frontrb->Base.Width,
 517                                     frontrb->Base.Height,
 518                                     backrb->Base.Data,
 519                                     buf->loaderPrivate);
 520 }
 521
 522
 523 /**
 524  * General device driver functions.
 525  */
 526
 527 static void
 528 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 529 {
 530     __DRIdrawable *buf = swrast_drawable(fb);
 531     __DRIscreen *screen = buf->driScreenPriv;
 532     int x, y;
 533
 534     screen->swrast_loader->getDrawableInfo(buf,
 535                                            &x, &y, w, h,
 536                                            buf->loaderPrivate);
 537 }
 538
 539 static void
 540 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 541 {
 542     GLsizei width, height;
 543
 544     get_window_size(fb, &width, &height);
 545     if (fb->Width != width || fb->Height != height) {
 546         _mesa_resize_framebuffer(ctx, fb, width, height);
 547     }
 548 }
 549
 550 static const GLubyte *
 551 get_string(GLcontext *ctx, GLenum pname)
 552 {
 553     (void) ctx;
 554     switch (pname) {
 555         case GL_VENDOR:
 556             return (const GLubyte *) "Mesa Project";
 557         case GL_RENDERER:
 558             return (const GLubyte *) "Software Rasterizer";
 559         default:
 560             return NULL;
 561     }
 562 }
 563
 564 static void
 565 update_state( GLcontext *ctx, GLuint new_state )
 566 {
 567     /* not much to do here - pass it on */
 568     _swrast_InvalidateState( ctx, new_state );
 569     _swsetup_InvalidateState( ctx, new_state );
 570     _vbo_InvalidateState( ctx, new_state );
 571     _tnl_InvalidateState( ctx, new_state );
 572 }
 573
 574 static void
 575 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 576 {
 577     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 578     GLframebuffer *read = ctx->WinSysReadBuffer;
 579
 580     swrast_check_and_update_window_size(ctx, draw);
 581     swrast_check_and_update_window_size(ctx, read);
 582 }
 583
 584 static void
 585 swrast_init_driver_functions(struct dd_function_table *driver)
 586 {
 587     driver->GetString = get_string;
 588     driver->UpdateState = update_state;
 589     driver->GetBufferSize = NULL;
 590     driver->Viewport = viewport;
 591 }
 592
 593
 594 /**
 595  * Context-related functions.
 596  */
 597
 598 static __DRIcontext *
 599 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 600                     __DRIcontext *shared, void *data)
 601 {
 602     __DRIcontext *ctx;
 603     GLcontext *mesaCtx;
 604     struct dd_function_table functions;
 605
 606     TRACE;
 607
 608     ctx = _mesa_calloc(sizeof *ctx);
 609     if (!ctx)
 610         return NULL;
 611
 612     ctx->loaderPrivate = data;
 613
 614     ctx->driScreenPriv = screen;
 615
 616     /* build table of device driver functions */
 617     _mesa_init_driver_functions(&functions);
 618     swrast_init_driver_functions(&functions);
 619
 620     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 621                                   shared ? &shared->Base : NULL,
 622                                   &functions, (void *) ctx)) {
 623       _mesa_free(ctx);
 624       return NULL;
 625     }
 626
 627     mesaCtx = &ctx->Base;
 628
 629     /* do bounds checking to prevent segfaults and server crashes! */
 630     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 631
 632     /* create module contexts */
 633     _swrast_CreateContext( mesaCtx );
 634     _vbo_CreateContext( mesaCtx );
 635     _tnl_CreateContext( mesaCtx );
 636     _swsetup_CreateContext( mesaCtx );
 637     _swsetup_Wakeup( mesaCtx );
 638
 639     /* use default TCL pipeline */
 640     {
 641        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 642        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 643     }
 644
 645     _mesa_enable_sw_extensions(mesaCtx);
 646     _mesa_enable_1_3_extensions(mesaCtx);
 647     _mesa_enable_1_4_extensions(mesaCtx);
 648     _mesa_enable_1_5_extensions(mesaCtx);
 649     _mesa_enable_2_0_extensions(mesaCtx);
 650     _mesa_enable_2_1_extensions(mesaCtx);
 651
 652     return ctx;
 653 }
 654
 655 static void
 656 driDestroyContext(__DRIcontext *ctx)
 657 {
 658     GLcontext *mesaCtx;
 659     TRACE;
 660
 661     if (ctx) {
 662         mesaCtx = &ctx->Base;
 663         _swsetup_DestroyContext( mesaCtx );
 664         _swrast_DestroyContext( mesaCtx );
 665         _tnl_DestroyContext( mesaCtx );
 666         _vbo_DestroyContext( mesaCtx );
 667         _mesa_destroy_context( mesaCtx );
 668     }
 669 }
 670
 671 static int
 672 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 673 {
 674     TRACE;
 675
 676     _mesa_copy_context(&src->Base, &dst->Base, mask);
 677     return GL_TRUE;
 678 }
 679
 680 static int driBindContext(__DRIcontext *ctx,
 681                           __DRIdrawable *draw,
 682                           __DRIdrawable *read)
 683 {
 684     GLcontext *mesaCtx;
 685     GLframebuffer *mesaDraw;
 686     GLframebuffer *mesaRead;
 687     TRACE;
 688
 689     if (ctx) {
 690         if (!draw || !read)
 691             return GL_FALSE;
 692
 693         mesaCtx = &ctx->Base;
 694         mesaDraw = &draw->Base;
 695         mesaRead = &read->Base;
 696
 697         /* check for same context and buffer */
 698         if (mesaCtx == _mesa_get_current_context()
 699             && mesaCtx->DrawBuffer == mesaDraw
 700             && mesaCtx->ReadBuffer == mesaRead) {
 701             return GL_TRUE;
 702         }
 703
 704         _glapi_check_multithread();
 705
 706         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 707         if (read != draw)
 708             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 709
 710         _mesa_make_current( mesaCtx,
 711                             mesaDraw,
 712                             mesaRead );
 713     }
 714     else {
 715         /* unbind */
 716         _mesa_make_current( NULL, NULL, NULL );
 717     }
 718
 719     return GL_TRUE;
 720 }
 721
 722 static int driUnbindContext(__DRIcontext *ctx)
 723 {
 724     TRACE;
 725     (void) ctx;
 726     return GL_TRUE;
 727 }
 728
 729
 730 static const __DRIcoreExtension driCoreExtension = {
 731     { __DRI_CORE, __DRI_CORE_VERSION },
 732     NULL, /* driCreateNewScreen */
 733     driDestroyScreen,
 734     driGetExtensions,
 735     driGetConfigAttrib,
 736     driIndexConfigAttrib,
 737     NULL, /* driCreateNewDrawable */
 738     driDestroyDrawable,
 739     driSwapBuffers,
 740     driCreateNewContext,
 741     driCopyContext,
 742     driDestroyContext,
 743     driBindContext,
 744     driUnbindContext
 745 };
 746
 747 static const __DRIswrastExtension driSWRastExtension = {
 748     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 749     driCreateNewScreen,
 750     driCreateNewDrawable
 751 };
 752
 753 /* This is the table of extensions that the loader will dlsym() for. */
 754 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 755     &driCoreExtension.base,
 756     &driSWRastExtension.base,
 757     NULL
 758 };